let’s build Rain Alarm with shaving blade. welcome to the world of raindrop magic, where you can create your very own rain detector alarm!, in this exciting adventure, we will learn how to build a simple circuit using a few components: a BC547 transistor, an LED, a buzzer, and a rain sensor made from two metal blades. Get ready to discover the wonders of rain detection in a fun and captivating way!.
What You’ll Need
Required components to build Rain Alarm with shaving blade
1
BC547 Transistor: A special component that helps us detect rain.
2
LED (Light-Emitting Diode): A tiny light that can shine with different colors.
3
Buzzer: A fantastic device that makes sound effects.
4
Rain Sensor: Two special metal blades that work like magic to detect rain.
5
Resistors: Tiny helpers to protect our components and make everything work smoothly.
6
Slide Switch: A cool switch that allows us to control the circuit.
7
9V Battery: Our power source to bring the circuit to life!
Making video
Circuit Diagram of Rain Alarm with shaving blade
Rain Alarm with shaving blade
1
Take the positive terminal of the battery and connect it to Blade 1 of the rain sensor.
2
Connect Blade 1 of the rain sensor to the Emitter (E) pin of the BC547 transistor.
3
Connect the Base (B) pin of the BC547 transistor to Blade 2 of the rain sensor.
4
Connect the Collector (C) pin of the BC547 transistor to the positive terminal of the buzzer.
5
Connect the negative terminal of the buzzer to the negative terminal of the LED.
6
Connect the positive terminal of the LED to one end of the 220-ohm resistor.
7
Connect the other end of the 220-ohm resistor to one terminal of the slide switch.
8
Connect the other terminal of the slide switch to the negative terminal of the battery.
Working of Rain Alarm with shaving blade
Rain Sensing
1
The rain sensor, made up of two metal blades, acts as a rain detector. When raindrops fall on the blades, they create a conductive path between them.
2
In a dry condition, there is no conductive path between the blades, and the circuit remains open.
3
However, when raindrops come into contact with the blades, they provide a conductive path, allowing electric current to flow.
Transistor Amplification
1
The BC547 transistor plays a crucial role in amplifying the current flow when rain is detected.
2
The rain sensor is connected between the Base (B) and Emitter (E) pins of the transistor.
3
In the absence of rain, the Base-Emitter junction acts as an open circuit, and the transistor remains off.
4
When rain is detected, the conductive path between the rain sensor blades completes the circuit and allows current to flow into the Base (B) pin.
5
This current flow triggers the transistor to amplify the current significantly between its Collector (C) and Emitter (E) pins.
LED and Buzzer Activation
1
The amplified current from the Collector (C) pin of the transistor activates both the LED and the buzzer.
2
The positive terminal of the buzzer is connected to the Collector (C) pin, while the negative terminal is connected to the negative terminal of the LED.
3
The LED lights up, indicating the detection of rain, and the buzzer produces a sound to draw attention to the rainfall.
Slide Switch Control
1
The slide switch allows you to control the operation of the rain detector alarm.
2
When the switch is in the “On” position, the circuit is energized and ready to detect rain.
3
In the “Off” position, the circuit is disconnected, and no power flows through it, effectively disabling the rain detection.
Conclusion
The rain sensor detects raindrops, creating a conductive path that triggers the transistor to amplify the current. This amplified current activates both the LED, providing a visual indication of rain, and the buzzer, producing an audible alert. So, You can easily turn the rain detector alarm on or off as needed using the slide switch.
Have fun using your rain detector alarm and exploring the wonders of rain detection!
